Grant Agreement (Details) - USD ($) $ in Thousands		1 Months Ended	3 Months Ended		9 Months Ended		49 Months Ended
	Sep. 15, 2015	Sep. 30, 2015	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Contracts Revenue			$ 2,507	$ 7,735	$ 9,846	$ 28,161
Bill Melinda Gates Foundation [Member]
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Contracts Revenue			$ 1,900		7,500		$ 80,000
Grant Agreement		$ 89,100			$ 89,100
GACA, Term of Contract From the Effective Date	15 years
GACA, Term of Contract After the First Sale	10 years
GACA, Extension of Maximum Term of Contract	5 years